I am going to start eprom burning for my car soon. I am going to order/make the cable first (I have a laptop already). Also, at work I saw a bunch of re-writable eproms, and my boss said I could use a couple. Does anyone know what chips I can use? I also just wanted to get an aftermarket chip to steal the socket to place new my chips in, but I am not sure what years I can use. It seems that corvette chips are the easiest/cheapest to come by. Can I use those? Any help would be appreciated. thanks.

 

Depends, from time to time they sell different adapters/ memcals. You have to actually look at what your getting.

What car are you working on?.
Too often someone assumes the sig line is what they are talking about and then things are wrong. Doing eproms means accurate guestions to get good info..

 

Currently, the only thing we know about your car is it is a 1989 GTA with a 5 speed. No engine size or mods.

If it is a stock MAF system with the 165 ecm, the actual eproms that will work in it are 27C128s (stock), 27C256s (need to program in a slightly different way as you only use the top half of the eprom) or AF29C256 Flash Proms (which are electrically eraseable and last infinitely longer than an eprom for a cost of only $5-6, shipping not included and some companies have a minimum order).

 

Sorry. I'll post my sig. I am planning on putting on a S/C and new injectors very soon too, that is why I am interested in chip burning. I am going to pull my chip/cradle and take a look at it. I'll post up what I see.

------------------
89GTA5spd – Engine: Stock G92 LB9 w/AFPR, JET Fan Switch, Air Foil, Ported Plenum, T.B Coolant by-pass, 180 T-Stat, Flowmaster 3” Cat-back – Transmission: Stock WC T-5, Suspension: Alston SFC’s, Hotchkis STB, Eibach Pro-Kit, 255 BFG Comp T/A’s – Power Adders: NOS TPI #5151 Kit-- Interior/Stereo: Autometer Phantom guages, Sony Deck, RF Subs, Orion amp – Times: (Stock) 1/8 9.78 sec w/ 2.42 sec 60ft, no times w/ S/C or N20 (yet.. )

 

Three possiblities:

1) Get any aftermarket eprom for your year of car that you can pick up used. For your year, the aftermarket eproms come with the ESC circuitry on it because the window on your ECM is too small to handle a "piggy back" eprom where the ESC circuitry flows through the "piggy back" which is connected to your stock Memcal.

2) Grind the window of your ECM wider so you can use a "piggy back" eprom with your stock GM Memcal. I like this option as you don't have to worry about whether the aftermarkt memcal that you picked up has the proper ESC circuitry. This is a problem if you EVER go into limp mode due to an SES condition.

3) Unsolder the eprom from your GM memcal and solder a ZIF socket on it.

If you haven't read it yet, I suggest reading Tim's (Traxions) article on "Prom Burning Introduction" that has a link posted on every page on the DIY Prom Board. It discusses the alternatives.

 

I'm taking the 27C256 Eprom in the carrier out and soldering in a 29C256 prom. No Zifs or adapters needed. I my car is currently set up to run both SD and MAF (165). If I program in a 16K bin in the upper half of the flash prom it works great. Just to be safe, I loaded it with a 32K FF.bin first since I understand that it erases as it writes. So if you only load the top half, the botttom half will retain data if once programmed in. Anyway, load the prom to 04000 to 07FFF for the 165.

Jason

Jason

[This message has been edited by 89vette (edited May 31, 2001).]